基于“关开”型掺杂碳量子点检测食用油中特丁基对苯二酚的研究

将柠檬酸(CA)为碳源与三羟甲基氨基甲烷(Tris)通过一步水热法合成含氮碳量子点(N-CQDs)。采用紫外光谱、红外光谱与荧光光谱手段分析其结构与光谱特性。研究发现，Fe³⁺能“关闭”N-CQDs的荧光，特丁基对苯二酚(TBHQ)的加入使得荧光重新“打开”,据此建立“关-开”型荧光探针测定TBHQ的新方法。结果表明，荧光强度与TBHQ质量浓度在1.00～33.24μg/mL范围内成良好的线性关系，回归方程y=0.283x+72.295,食用油样品加标检测回收率为90.51%～105.80%。该方法可用于食用油中TBHQ的快速分析检测。

Detection of T-butylhydroquinone in edible oil based on on-off doping carbon quantum dots

Nitrogen-containing carbon quantum dots (N-CQDs) were synthesized with citric acid (CA) as carbon source and trihydroxymethylaminomethane (Tris) by a one-step hydrothermal method. Its structure and spectral characteristics were analyzed by ultraviolet spectrum, infrared spectrum and fluorescence spectrum. It was found that Fe3+ can "turn off" the fluorescence of N-CQDs, and the addition of tert-butylhydroquinone (TBHQ) can make the fluorescence "turn on" again. Based on this, a new method for the determination of TBHQ was established. The results showed that there was a good linear relationship between fluorescence intensity and TBHQ concentration in the range of 1.00~33.24 μg/mL. The regression equation Y=0.283X+72.295. The recoveries of oil samples were 90.51%~105.80%. This method can be used for rapid analysis and detection of TBHQ in edible oil.